Estrous CycleEstrusProgesteroneCell CycleCorpus LuteumDiestrusProestrusOvaryEstradiolUterusPregnancy, AnimalOvulationLuteinizing HormoneDinoprostOvarian FollicleEndometriumPregnancyOvariectomyCattleLuteolysisFollicle Stimulating HormoneLuteal PhaseSheepMenstrual CycleFollicular PhaseEstrus SynchronizationAnestrusOxytocinLuteal CellsGonadotropin-Releasing HormoneReproductionRNA, MessengerFallopian TubesSwineInhibinsVaginaGenitalia, FemaleTime FactorsCell Cycle ProteinsEstrus DetectionRadioimmunoassayPseudopregnancyFertilityMyometriumSexual MaturationFollicular AtresiaPostpartum PeriodEstrogensEmbryo ImplantationProstaglandins FImmunohistochemistryPregnancy ProteinsGonadal Steroid HormonesFollicular FluidPituitary Gland, AnteriorSuperovulationGonadotropinsPregnenedionesInsemination, ArtificialGranulosa CellsPituitary GlandDrug Implants5-alpha-DihydroprogesteroneRats, Sprague-DawleyCitric Acid CycleCorpus Luteum MaintenanceProgesterone CongenersProlactinMelengestrol AcetateRandom AllocationTheca CellsChorionic GonadotropinHormonesOrgan SizeGene Expression20-alpha-Hydroxysteroid DehydrogenaseIn Situ HybridizationCloprostenolGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionPregnadienesMonocrotophosNeurophysinsCarbofuranAbortifacient AgentsSus scrofaMesocricetusFollicle Stimulating Hormone, beta SubunitHorsesEtherAndrostenedioneReceptors, LHFollistatinElephantsFollicular CystSexual Behavior, AnimalPeriodicity3-Hydroxysteroid DehydrogenasesProgestinsHypothalamus